if (typeof key !== 'string') throw new Error('The YouTube API key you provided was not a string.');

[Feh's]

Hello hello I have an error on line 26, and I can't solve it already I tried to install past versions but it gives error too!

if (typeof key !== 'string') throw new Error('The YouTube API key you provided was not a string.');
^

Error: The YouTube API key you provided was not a string.

[Will Nelson]

Ensure that the YouTube API key you are providing is a string.

[Feh's]

Okay, thanks I had forgotten to pass the key!